Before we get underway: I'm sorry, we don't have enough headline space to write 'KDE Releases Development Platform, Applications and Plasma Workspaces 4.6.0'. Then again, do any non-anal people every refer to it that way? No? I thought so. In any case, there's a new KDE version out with lots of new features, bug fixes, and performance enhancements.

You don't have to navigate to the website, as any of these can be installed directly from the desktop settings dialog box. There are separate themes for the desktop itself (Plasma themes) and the windows/widgets.

For good integration with GTK applications, be sure to choose a theme that explicitly claims such integration as a feature.